Scooterotica

LI150 wrote:The mallosi head is to high compression IMO and you would need to at least have timming at 15/16 deg. I could never stop mine pinking even with running a Mtech retard system and the timming retarding to 12 deg. I replaced my head with a SIP one and now its perfect.

same here, running the malossi head, i must have been round by 14/15 deg to stop the pinking. got a SIP head, this one if I recall
http://www.sip-scootershop.com/EN/produ ... r_13013855

problem solved, and ignition back to 18deg, far cleaner running and smoother pickup, and importantly, no pinking. running std si24 BTW

Check the piston at BDC before deciding on base gasket, it's only a gnat's knacker thick so doesn't make a huge amount of difference if you ask me.
Head gasket is different........... with PM head I had to use it which put my squish out, but lowered compression (still pinked,) with Taffy head no need for gasket, good squish and big bowl!
Ian did a head for a mate of mine (Polini,) a few months back so maybe you could give him a shout?

joey there were know gaskets on this topend at all , plus im not sure what size crank is either will know more tomoro when i split the motor, im not sure if to use gaskets as for all this stuff about squish ive never done it before

ricalnic thanks for the link , had alook an it say to make sure an buy all the gaskets for the topend an rubber O ring is all this nessacary , i know you said that you were using a standard carb , but this motor im working on has 28mil spaco on it prob not the best carb in the world or easyest carb to setup anybody on here have any jetting advise for this thanks

Hi. that sort of damage is what joey has said... add lean mix or wrong pipe too. Its got bloody hot on ex side. so either the burn was too hot caused by over-advanced ign, too higher comp, lean mix or maybe a stinger (on pipe)thats reflecting too much heat for your mates setup.
On a prange often they suffer from fuel head probs. This motor may need a faster flow tap or even a pump system. Ask if this happened as the fuel level dropped in the tank
I would use a base gasket and squish the motor correctly. Check the various head specs out there and aim for about 9:1 comp ratio uncorrected. I used to do these malossi's at kegra.. we would back the stator completely off and mod the heads back then.

See now this is what I like about SCOOTEROTICA people do actually come on and give good advice (although to be honest most of the forum, including GENERAL SCOOTER CHAT seems to be about Lambrettas, obviously they're not quite as reliable as the chubbier of the marques,) but sometimes the advice can be way too indepth......
Tony you're a racer, mucho respecto, but not everyone knows how to build the ultimate motor ( f uck me I don't,) and so what we want is a motor that will get us to rallies at a decent turn of pace when the need arises. Don't get me wrong, I agree 100% with what you say (with my limited knowledge,) but the lad has just said he doesn't know what a squish is never mind how the stinger affects the heat reflection, so can someone give the poor lad some advice on a decent head, pipe, and carb set up that's safe to ride at a decent pace?

joeythescooterboy wrote:.......... the lad has just said he doesn't know what a squish is never mind how the stinger affects the heat reflection, so can someone give the poor lad some advice on a decent head, pipe, and carb set up that's safe to ride at a decent pace?

I suppose what Tony has done is try to give the guy a full answer, which is the correct thing to do. You cant ask someone who knows what they are talking about to give 'half an answer'. The question of 'decent' head, pipe, carb etc is actually quite subjective in terms of the motor as a whole and its overall measurements.

I suppose if Danger is up to the task of splitting the motor, posting pics, and asking tech questions.......maybe he would like us to answer in full, so that if there is something he doesnt know how to do, he can learn about it?

Danger, read this: http://scooterotica.org/forum/viewtopic.php?f=5&t=11 and then this: http://scooterotica.org/forum/viewtopic.php?f=5&t=10767 and then this: http://scooterotica.org/forum/viewtopic.php?f=5&t=9439


If you can get your head round that lot, then you are half way to solving your problem! ;o) If you don't understand any of it, or its too in depth, just ask here and someone will answer.

And.....if you get the bug, then read this! http://edj.net/2stroke/jennings/2stroke ... ndbook.pdf

Sorry, I wasn't knocking Tony, not at all, I love all the techy stuff (don't understand it but love it all the same!)

hi an thaks everyone above , yes im a novise when it comes to indepth tuning ive done malossi 210,s in the past more or less on standard form tho standard carb , crank , an sum form of pipe an alittle porting on the casings just to clean it up abit, anyway this engine has alot more done to it , it has a pm pipe , 28 mil spaco an ported casings in pics above split engine today an took a few more pics i found that it had DR SCOOTERS an the letters PH engraved inside , also ive found some scoring on the flywheel side of the casings an on the crank has been rubbing also had a look at the crank an seen this is this crank fecked see pics thanks

i have since been told that the fella that originaly built this engine an done all the porting work worked for dr scooters then left to setup on his own an is now JB tuning or so im told